Most likely due to multiples sharing the load and not necessarily the particular speaker. This is often overlooked. As long as the driver is up to the task and you can use multiples, then anything similar would also be impressive.

No I am not. I would like you to try the RE XXX 12" XBL version. I'm sure the Xmax is out of this world on it too.

I wonder how ScanSpeak rates their linear xmax figures. On the Illuminator their figures are just under what Erin's Klippel results show for them at 10%. I wonder if the same would be true for the subwoofers as well. In other words, if that 14mm rating would match up to a Klippel measured 10% figure.

The Illuminator 7" first came out with a rating of +-6mm, then it went up to 9mm+-. The two Klippel tests we've seen so far have been 9.2mm or 10mm using the least linear parameter. So, either way it's underrated. In Erin's tests, the motor was linear to 11.5mm, which is what a reputable firm would rate it at if they were at least a bit stringent and realistic.

Depending on how you want to rate xmax, Illuminators and Revelators have been anywhere from mildly underrated to severely underrated. That is not the case with all Discovery drivers...

George, I think I told you my plans at the last gtg. If this thing could get to 17mm as clean as the NE315 gets to 11.9, I could shrink the setup and drivers used by a third. That would give me much more flexibility in mounting them.